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heater components air flow switch
main electric gas valve and hydramotor - TM-5-3895-374-24-2_527

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 MAIN GAS VALVE HYDRAMOTOR The  gas  valve  on  your  heater  is  equipped  with  a  proof  of  closure  switch.    This  is  an  externally mounted  micro-switch  which  is  actuated  and  closes  the  control  circuit  when  the  gas  valve  has returned to the closed position.  It prevents the burner  from recycling if the gas valve did not fully close following the previous burner cycle. The hydramotor and valve assembly are "PUSH when energized" type for ON-OFF operation. The operating  mechanism  is  completely  immersed  in  oil,  which  eliminates  usual  maintenance  and service.  (See Gas Flow Schematic, Section 5.9) Operation When  the  actuator  terminals  are  powered,  the  relief  valve  closes  and  the  electric  motor-driven pump   applies    hydraulic    pressure    to    the    spring-loaded    piston,    pushing    the    actuator    stem downward.    When  the  actuator  stem  reaches  full  travel,  the  travel  limit  switch  opens  the  pump motor circuit to stop the pump action.  The relief valve remains energized and closed, holding the stem downward.  When the control circuit is broken, the relief valve opens and the spring-loaded piston and valve stem return to the up, de-energized, position, closing the valve.  Note that when actuator  is  held  in  energized  position,  the  motor  may  restart  intermittently  to  maintain  proper pressure against the piston. CAUTION: USE   MIL   SPEC   5606   OIL   FOR   REFILLING   HYDRAULIC   UNIT,   AVAILABLE FROM  ITT  GENERAL  CONTROLS,  OR  USE  GEMLINE  REFRIGERATION  OIL, AVAILABLE FROM MOST REFRIGERATION SERVICE OUTLETS. 1. Remove fill plug from top of actuator pump unit. 2. Fill unit with oil to within 1/4 to 1/2 inch from bottom of fill plug hole. page 3 - 1160







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